Environmental geochemistry investigation of water, sediment and soils in the Darreh-zar porphyry copper deposit(Kerman)


1 Department of Earth Sciences, Faculty of Sciences, Shiraz University

2 Department of Earth Sciences, Faculty of Sciences, Islamic Azad University, Shiraz Branch

3 Research and Development Division, Sar Cheshmeh Copper Complex, Kerman


The Darreh-zar porphyry copper deposit is located in the south of the Sarcheshmeh copper mine. In this study, environmental impact of mineralization and mining in the Darreh-zar porphyry copper deposit was investigated. For this purpose, eleven water samples, thirty-three sediment samples and fifteen soil samples were collected and analyzed. Correlation coefficients between different parameters of water samples were calculated. The results showed that samples with low pH have high concentration of sulfate and heavy metals, higher than the maximum permissible level(MPL). Plotting the concentration of major cations and anions in Piper triliner and Durov diagrams revealed that most water samples are of Ca-sulfate type. Based on the results of principal component analysis for measured parameters in water samples, 3 clusters were distinguished. Calculated geoaccumulation index and enrichment factor, indicate sediment enrichment in potentially toxic metals(Cu, Mo, Pb and Sb). The results also showed high Mo, Cu and Pb content in soil. Most soil samples with Mo anomaly content were associated with gossans. It is concluded that, in soil environment, oxidized molybdenum occurs predominantly as immobile acid molybdate anion.


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